Convert aos over to flatbuffers

Everything builds, and all the tests pass.  I suspect that some entries
are missing from the config files, but those will be found pretty
quickly on startup.

There is no logging or live introspection of queue messages.

Change-Id: I496ee01ed68f202c7851bed7e8786cee30df29f5
diff --git a/aos/libc/BUILD b/aos/libc/BUILD
index 48a9ffd..234c29a 100644
--- a/aos/libc/BUILD
+++ b/aos/libc/BUILD
@@ -9,7 +9,7 @@
         "aos_strsignal.h",
     ],
     deps = [
-        "//aos/logging",
+        "@com_github_google_glog//:glog",
     ],
 )
 
@@ -20,7 +20,6 @@
     ],
     deps = [
         ":aos_strsignal",
-        "//aos/logging",
         "//aos/testing:googletest",
     ],
 )
diff --git a/aos/libc/aos_strsignal.cc b/aos/libc/aos_strsignal.cc
index a3331f9..9262ac6 100644
--- a/aos/libc/aos_strsignal.cc
+++ b/aos/libc/aos_strsignal.cc
@@ -2,14 +2,15 @@
 
 #include <signal.h>
 
-#include "aos/logging/logging.h"
+#include "glog/logging.h"
 
 const char *aos_strsignal(int signal) {
   static thread_local char buffer[512];
 
   if (signal >= SIGRTMIN && signal <= SIGRTMAX) {
-    AOS_CHECK(snprintf(buffer, sizeof(buffer), "Real-time signal %d",
-                       signal - SIGRTMIN) > 0);
+    CHECK_GT(snprintf(buffer, sizeof(buffer), "Real-time signal %d",
+                      signal - SIGRTMIN),
+             0);
     return buffer;
   }
 
@@ -17,6 +18,6 @@
     return sys_siglist[signal];
   }
 
-  AOS_CHECK(snprintf(buffer, sizeof(buffer), "Unknown signal %d", signal) > 0);
+  CHECK_GT(snprintf(buffer, sizeof(buffer), "Unknown signal %d", signal), 0);
   return buffer;
 }